One of the most popular courses in physics is astronomy. However, the topics taught require visualizations that are not familiar to the typical students in these courses. To address this issue, we have created a set of flexible resources for the teaching of introductory astronomy based on two- and three-dimensional simulations. These simulations are created with Easy Java Simulations (EJS) which is a free and open source tool for creating Java simulations. Because EJS allows teachers to easily change simulations, existing simulations can be customized to the type of astronomy course one is teaching. In this workshop, we will describe how to use and modify astronomy simulations such as the celestial sphere, Ptolemaic and Copernican models, Keplerian orbits including eclipses, galactic collisions, and orbits about black holes. All of these materials will be distributed on the OSP Collection on the ComPADRE digital library.